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Zhihu Tech Column

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Latest from Zhihu Tech Column

18 recent articles

Zhihu Tech Column

Jun 11, 2025 · Artificial Intelligence

How Minute‑Level Time Decay Boosts User Retention Modeling in Recommendation Systems

This article presents a novel minute‑level future‑reward framework with dual‑delay incentives, activity‑based attribution, multi‑task delayed modeling, and sequential streaming training that dramatically improves user retention prediction accuracy and real‑time performance in large‑scale recommendation platforms.

User Retentiondeep learningmulti‑task modeling

0 likes · 17 min read

How Minute‑Level Time Decay Boosts User Retention Modeling in Recommendation Systems

Zhihu Tech Column

Mar 14, 2025 · Artificial Intelligence

Insights from Zhihu’s ZhiLight Large Model Inference Framework: Architecture, Parallelism, and Performance Optimizations

The article summarizes Zhihu’s technical talk on the ZhiLight large‑model inference framework, detailing model execution mechanisms, GPU load analysis, multi‑GPU parallel strategies, open‑source engine comparisons, compute‑communication overlap, quantization techniques, benchmark results, and future directions for scalable LLM deployment.

GPU parallelismLarge Language ModelsSGLang

0 likes · 11 min read

Insights from Zhihu’s ZhiLight Large Model Inference Framework: Architecture, Parallelism, and Performance Optimizations

Zhihu Tech Column

Jan 17, 2025 · Artificial Intelligence

Zhihu Direct Answer: Product Overview and Technical Practices

This article summarizes the key technical insights from Zhihu Direct Answer, an AI-powered search product, covering its product overview, RAG framework, query understanding, retrieval strategies, chunking, reranking, generation techniques, evaluation methods, and engineering optimizations for cost and performance.

AI SearchChunkingEngineering Optimization

0 likes · 13 min read

Zhihu Direct Answer: Product Overview and Technical Practices

Zhihu Tech Column

Dec 31, 2024 · Cloud Native

Cloud Native Innovation Forum: AutoMQ Table Topic, OceanBase Integrated Database, and Observability Practices

The article recaps Zhihu's Cloud Native Innovation Forum where experts from AutoMQ, OceanBase, and Flashcat shared practical solutions on streaming data ingestion, unified database architectures, and AI‑driven observability, highlighting real‑world deployments, performance optimizations, and cost‑saving strategies.

AIAutoMQCloud Native

0 likes · 10 min read

Cloud Native Innovation Forum: AutoMQ Table Topic, OceanBase Integrated Database, and Observability Practices

Zhihu Tech Column

Dec 25, 2024 · Databases

Technical Challenges and Solutions for Migrating Zhihu's Self‑Managed MongoDB Cluster to Alibaba Cloud

The article analyzes the storage, sharding, backup, and operational pain points of Zhihu's self‑operated MongoDB cluster, proposes cloud‑based architectural and procedural solutions, and details a step‑by‑step migration plan that ensures zero‑downtime, improved stability, and cost efficiency.

Alibaba CloudCloud ComputingMongoDB

0 likes · 11 min read

Technical Challenges and Solutions for Migrating Zhihu's Self‑Managed MongoDB Cluster to Alibaba Cloud

Zhihu Tech Column

Dec 9, 2024 · Artificial Intelligence

Large Model Application Engineering: ZhiLight Inference Framework and Zhihu Direct Answer System

The article details Zhihu's technical salon on large‑model engineering, covering the RAG‑based Zhihu Direct Answer system, the open‑source ZhiLight inference framework, prompt engineering, agent research, and future plans for integrating AI into product and community workflows.

AI EngineeringAgentInference Framework

0 likes · 8 min read

Large Model Application Engineering: ZhiLight Inference Framework and Zhihu Direct Answer System

Zhihu Tech Column

Oct 28, 2024 · Databases

TiDB Architecture, Deployment Choices, and Zhihu’s Database Platform Practices

This article explains TiDB’s distributed relational database architecture, compares Kubernetes‑based and physical‑machine deployments, and describes Zhihu’s platform‑driven approach—including TiDB Operator, TiUP, self‑service tooling, monitoring, backup, security, and FinOps—to enable efficient database management for both developers and DBAs.

Data MigrationDatabase operationsFinOps

0 likes · 15 min read

TiDB Architecture, Deployment Choices, and Zhihu’s Database Platform Practices

Zhihu Tech Column

Oct 10, 2024 · Artificial Intelligence

Massive Multi-Label Text Classification via Semantic Retrieval and Large AI Model

This article presents a method for massive multi-label text classification on Zhihu content by combining a semantic retrieval model with a proprietary large AI model, detailing the challenges of large label spaces, model architecture, loss optimization, and experimental results showing significant accuracy gains.

BGELarge Language Modelmulti-label classification

0 likes · 16 min read

Massive Multi-Label Text Classification via Semantic Retrieval and Large AI Model